Max Papis was not happy with young driver Billy Johnson for running him off the track during the Nationwide Series race at Road America Saturday, so Papis gave Johnson a light slap on pit road after the race.

Papis, who ran in the top 10 most of the race but finished 17th, lightly slapped Johnson on the side of his helmet as he walked by him on pit road.

“I apologize to all the kids,” Papis, a former IndyCar driver and road-racing specialists, said after the incident. “I should not have slapped him here, I should have slapped him inside.

“My temper got the best of me. I was just disappointed because the 16 car just ran me off the track, and we were having a great race.”

Johnson, who was driving Roush Fenway Racing’s No. 16 car, took the blame for the incident.

“I guess he was living up to his name ‘Mad Max,’” Johnson said. “As far as the incident on the track, that was my fault. Everybody was checking up really early and I got into the back of him. … He took it a little personally.”